Process of making metallic structural elements



-. ad. 7", i924- l 1,510,702 N. C. RENDLEIVIUA PRDESS 0F MAKING METALLIC STRUCTURAL ELinsmNT's` Filed Feb. 13 1922 2 sens-sneet 1 i In s?, 92%. d l

Q. RENLEMN Pooss 0F MAKING METALM'C STRUCTURAL ELEMENTS Filed Feb'. 15, 1922 2 Samana-sheen 'ex .I 34, l x fs-\ -i d I *A A @MMM/Join..-

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Nonnen o. einnehmen, on mentions; :e :z

testversie, sesiones; BY Mnsim Asi Psooese on emmer-.me ssncfrvnsi ELEMENTS.

eppneamn site February is, 1922. serial nu. 536,333.

To all whom t may conceive) Be it known that l', NosMAN C. Enneige- MAN, a, citizen of the United Stetes, end a ijesident of lorznont, eounty oi .Allegheny,'. State oi Penne lvenia., have invented en lnx-l giovement in recesses of Melting Metalli@ Structural Elements.' of which the following is e speciiioetion. l

The pnesent invention yrelates to the :menulG facture of metallic beams and like structural elements intended to' i'esist 'heavy streins, v and which are ooiilmonly rolled steel sbefes sash les -beems,l"-beems, etc. .it is e so epplioeble to .dot-strips and plates.

llt has been proposed heretofore to increase the dstrength of such beams per unit of weil, particularly in're'sistenoe to transverse ding. and eompressive strains, by giving to the initegrslj'web'portion a. truss 2G stnotiire saches is oomnion in nomintegrel bniloup booms. f Taking nished' li-besin es en exemple, it has been proposed to ont the web by two onlmore's'eiies of longitud# nel. slits in staggered ieletionto one another, and then site? the beomflias been suitably heated, to separate the opoosite side ienges, thus stretching the meta in the web and opening out the slits, so es to form integral die onel truss-members oonnecting the opposite flanges, end resolving the web es e. whole into e series of adjacent oppositely arranged triangles without changing the lineal dimensions of the beam.

An object of my invention is to menuisetine the seme' pi'odnot by s. method which does away with :the stretching of the metal of this truss-member. ln this operation the web is slitted and the beam. heated es before. lt is then psssed thnough rolls which operate only upon the web o: the beam, which reduce and elongste the metal of web..

while the opposite hongos vi'en'ieiso oi the `same length, suoli elongation of the web causing it to ,tolse the fom of unduletions, and b sopemtin the ienges the boem is spl'e or expen edl to nishecl imm end width Without steetohing the motel.

Another obieetof my invention is to impiove upon prio? methods by expanding the boem immeietel r as it from the inishingps.ss of t e bee asili. end without A fehesting, thus greatly refineng the oost of ,l mennizvstuie en at the time shielding s. more uniform. and homogeneous pionnen iurriexiinumA strength.

A fnrthei objeot is to control the undulaf.

tions of the web, caused by its reductionk end elongation in the second method, as to reduce strains to a minimum. A still further obj; eet is togive to the truss-members of the finished beam 'a oross-seetional v forniof En' the 'a'coompanying l'drewings vthere is illustrated the practice of the invention in connection with an I-benm. Figure 1 shows in elevation end in cross-section a. slitted I- the same after the reduction and elongation of the web by rolling; Figure 3 Shows .in perspective the preferred manner of vsepa.- mting the opposite flanges vand thereby forming the truss-members from the web; Figure 4 is a. lView in elevation of the inlshed beam; Figures 5 Glare enlarged .65 beam; Figure 2's a. longitudinal section of i cross-sectional. views on the'lines V-V and v 'Vl-VL respectively of Figure 4.

The entire operation 1s .performed lipon 'the beam or other shape' as' it comes from the finishing( pass of therollingfmill, and without reheeting. This results in greet economy, and gives o better product since the.

metal is not subjected-to deterioration by reposted hosting. The beam as rolled is first subjected to the action of a. ,shear, ,which forms in the webthe slits 1 as shown in Figure 1, the adjacent rows of slits being in staggered relation to one another. In the present cese three'rows of slits are shown, but there may be onlyA two rows, one row adje/cent to each of the enges, or i'n othercases there may be more. than three rows. f

i From the sheer the beam is passed through a' rolling-mill, the rolls of which operate only upon the web, `leavin the opposite anges free, and the elect o this rolling 'is to i'eduoei end elongate the web of the beam without changing the length of the opposite enges. This operation will cause longitudinel bows' or .undulwtions between the points 2 where the web remains tied tothe iienges,v end in order to control these uncluletions, guides 3 are placed above and below the web portion of Uhebeam etthe discharge side oi the roll pass,tl1nsv giving theweb povtion of the beam the general form shown in' Figure 2.

The spreading eport of the opposite enges may be accomplished in mamy ways, es .may be prefered, or dependent upon the particular shape of 'the beam or other section being'operatedupon. In the case of the I-beams it 'is preferred to accomplish this stretching by passing the rolled sect-ion longitudinally A over gradually "diverging' -guides 5 as shown in Figure 3, thus bringing the article to the .finished width. rllhen it found necessary or desirable it may be subjeoted to another rollin operatiom'though that may not always be necessary.

- The pass between the rolls may of course be a plain pass, which will result in the.

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truss-members having a general rectangular form in cross-section. But 1n order to malte the truss-members of such cross-sectional v form' as to give them maximum strength, it

is preferred to form the roll passso as to impart to the metal of 'the web between .each row of slits the form shown inFigure 5 of the drawings, which is essentially the form of an l-beam7 and when the flanges arel pulledapart the truss-members will consequently have.d this cross-sectional form. Their form atthe points of their junction with each other is shown in Figure G.-

It will be apparent that the method whichconstitutes .the present invention may be practiced upon beams and like articles oft a variety ot' shapes, and it may also be used` lor the formation of a. truss structure or network between the opposite margins oi' 4flat plates. Such Hat reticulated plates may be use-d to great Vadvantage in the construetion ot roadways, and they have other valuable uses as well. For that reason in the appended claims the term metal bar fication iseused generally tov designate inditierently beams, plates or other metallic shapes upon which the method may be. used. It is valso apparent that'the method is capable of being practiced by the use of rarities of apparatus.v and that it is also capable of a considerable amount of modi- Without departure from thev essence of the intention.

lllithout limiting myself to 'the embodi ments described, l claim the following as my invention:

l. The method otfabricaling' a metallic bar, which. comprises slitting the metal of the bar between opposite marginal portions, rolling said slit portion to reduce its crosssectional area and elongate it with reference to said marginal portion, and spreading` the bar by separating said margii-ialiportions without substantial elongation ofsaid slit ortions.

2. The method of fabricating a metallic bar which comprises slitting the median por* tion to form two parallel rows of connectingl interne portions, and spreading the bar by separat-- ing said marginal portions,

l. The method ot' fabricating av metallic bar, which comprises rolling the bar, and while. it is still at the elevated temperature incident to such rolling, slitting and rolling to greater length the metal ot" the bar bee tween its. opposite longitudinal marginal portions and without extending said man ginal portions, and then spreading the bar.

5. The method of fabricating a metallic bur, which comprises slitting and rolling to greater length the metal of the bar between its opposite longitudinal portions Without extending said marginal portions, thereby giving said rolled portion an undulatorj: form, controlling the amplitude of the undulations and spreading the bar.

v 6. The method of manufacture 0i trussed iretallic beams, which comprises rolling the beam, forming in its web a plurality oit rows of longitudinal slits, the slits in adjacent rows being in staggered relation, reducing and elongating the slitted web while hot and without extending the opposite margins of the beam, und in such rolling giving to the metal between adjacent .rows ci slits a beam .like cross-sectional form', and then spreading' apart said margins of the beam and thereby laterally opening` the slits, substantially as described.

7. The method oii-tabrieatingl a metallic bar which comprises slitting the median portion to forni two parallel rows of conneeting' members joined to each other at adjacent ends and to the margins oi. the bar at opposite ends, rolling said connecting inem- 'bers to reduce and lengthen them, and separating-.the margins of the bar to open out said connecting members to :form a lattice connecting said margins.

In testimony whereof, l have signed my name to this specification this 11th day of February, A. D. 1922.

NRMAN C. RENDLEMAN. 

